Oil displacement method suitable for heavy oil reservoir

An oil displacement method and technology for heavy oil reservoirs, which are applied in the field of oil displacement of heavy oil reservoirs, can solve the problems of low recovery factor of high-concentration heavy oil, etc., and achieve improved recovery factor, strong stability, and wide viscosity range. Effect

Active Publication Date: 2019-11-12
ZHEJIANG OCEAN UNIV
View PDF9 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the problem of low recovery of high-concentration heavy oil in the prior art, and provides an oil displacement method suitable for heavy oil reservoirs, suitable for crude oil with a viscosity lower than 5000mPa·s, and suitable for a wide range of crude oil viscosity , and the recovery factor for high-viscosity heavy oil reservoirs has been greatly improved

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Oil displacement method suitable for heavy oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of magnetic nano Fe3O4@SiO2 particles comprises the following steps:

[0026] 1) Fe 3 o 4 Preparation of nanoparticles: dissolving sodium hydroxide in water to form a sodium hydroxide solution with a concentration of 80g / L; adding an equal volume of FeCl 3 solution and FeSO 4 The solution is mixed to obtain a mixed solution of iron salt, FeCl 3 Solution is FeCl 3 Mixed aqueous solution with HCl, FeCl 3 Concentration is 2mol / L, HCl concentration is 0.5mol / L; FeSO 4 Solution is FeSO 4 Mixed aqueous solution with HCl; FeSO 4 The concentration is 1mol / L; the concentration of HCl is 0.5mol / L; the sodium hydroxide solution is heated to 70°C, and the iron salt mixed solution is added dropwise to the sodium hydroxide solution, and the amount of the iron salt mixed solution added is sodium hydroxide 15wt% of the solution, stop heating until the solution turns black, cool to room temperature, separate the black product generated by the reaction, was...

Embodiment 2

[0035] The preparation method of magnetic nano Fe3O4@SiO2 particles comprises the following steps:

[0036] 1) Fe 3 o 4 Preparation of nanoparticles: dissolving sodium hydroxide in water to form a sodium hydroxide solution with a concentration of 80g / L; adding an equal volume of FeCl 3 solution and FeSO 4 The solution is mixed to obtain a mixed solution of iron salt, FeCl 3 Solution is FeCl 3 Mixed aqueous solution with HCl, FeCl 3 Concentration is 2mol / L, HCl concentration is 0.5mol / L; FeSO 4 Solution is FeSO 4 Mixed aqueous solution with HCl; FeSO 4 The concentration is 1mol / L; the concentration of HCl is 0.5mol / L; the sodium hydroxide solution is heated to 75°C, and the iron salt mixed solution is added dropwise to the sodium hydroxide solution, and the amount of the iron salt mixed solution added is sodium hydroxide 15wt% of the solution, stop heating until the solution turns black, cool to room temperature, separate the black product generated by the reaction, was...

Embodiment 3

[0045] The preparation method of magnetic nano Fe3O4@SiO2 particles comprises the following steps:

[0046] 1) Fe 3 o 4 Preparation of nanoparticles: dissolving sodium hydroxide in water to form a sodium hydroxide solution with a concentration of 80g / L; adding an equal volume of FeCl 3 solution and FeSO 4 The solution is mixed to obtain a mixed solution of iron salt, FeCl 3 Solution is FeCl 3 Mixed aqueous solution with HCl, FeCl 3 Concentration is 2mol / L, HCl concentration is 0.5mol / L; FeSO 4 Solution is FeSO 4 Mixed aqueous solution with HCl; FeSO 4The concentration is 1mol / L; the concentration of HCl is 0.5mol / L; the sodium hydroxide solution is heated to 65°C, and the iron salt mixed solution is added dropwise to the sodium hydroxide solution, and the amount of the iron salt mixed solution added is sodium hydroxide 15wt% of the solution, stop heating until the solution turns black, cool to room temperature, separate the black product generated by the reaction, wash...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
viscosityaaaaaaaaaa
viscosityaaaaaaaaaa
viscosityaaaaaaaaaa
Login to view more

Abstract

The invention relates to the technical field of crude oil collection, and discloses an oil displacement method suitable for a heavy oil reservoir. A Pickering emulsion system and a foam system are subjected to alternate oil displacement for 2-4 times in a slug combination mode, the total slug injection amount of the Pickering emulsion system and the foam system is 0.4-0.8 PV, an emulsifying agentof the foam system comprises magnetic nano Fe3O4@SiO2 particles and a foaming agent, and an emulsifying agent of the Pickering emulsion system comprises magnetic nano Fe3O4@SiO2 particles, a surfactant and a polymer. The oil displacement method is suitable for crude oil with the viscosity being less than 5000 mPa.s, the suitable crude oil viscosity range is wide, and the recovery ratio of the high-viscosity heavy oil reservoir is significantly increased.

Description

technical field [0001] The invention relates to the technical field of crude oil collection, in particular to an oil displacement method suitable for heavy oil reservoirs. Background technique [0002] With the development of industry, the contradiction between the social demand for oil and the serious shortage of oil resources has become increasingly serious. How to extract more oil from the developed oil fields has become the focus of research. With the advancement of science and technology, some special reservoirs are being developed more and more, such as low permeability reservoirs, ultra-low permeability reservoirs, high temperature and high salinity reservoirs and so on. The viscosity of flowable heavy oil is usually as high as thousands to tens of thousands of mPa·s. Due to the large difference in the mobility ratio of water and heavy oil, it is easy to cause water fingering, resulting in ineffective displacement and low recovery. Exxon Company first proposed the P...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/584C09K8/588
CPCC09K8/584C09K8/588E21B43/16
Inventor 龙运前黄小荷刘静冷哲陈立桥王永政王任一宋付权
Owner ZHEJIANG OCEAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap